KR20220080188A - electromagnetic valve - Google Patents

Abstract

Disclosed is an electromagnetic valve, comprising: a valve body 110 , a valve sleeve 210 , a valve element 220 , a fixed iron core 260 , a movable iron core 230 , and a first valve port portion 322 . Including, and further comprising a limiting member 250, a first spring 270, and a second spring 280, one end of the first spring 270 is in contact with the limiting member 250, the first spring ( The other end of the 270 is in contact with the fixed iron core 260 , one end of the second spring 280 is in contact with the movable iron core 230 , and the other end of the second spring 280 is in contact with the valve element 220 . abutting, the limiting member 250 includes a first limiting part 251 , the movable iron core 230 includes a second limiting part 233 capable of abutting the first limiting part 251 , and is movable The iron core 230 can drive the limiting member 250 to move it in the direction of the fixed iron core 260 , the valve element 220 includes a third limiting part 221 , and the movable iron core 230 includes the second limiting part 221 . and a fourth limiting part 242 capable of abutting the third limiting part 221 , and the movable iron core 230 may drive the valve element to move in the direction of the fixed iron core 260 . According to the electromagnetic valve of the present solution, the valve opening cavity of the electromagnetic valve can be improved.

Description

electromagnetic valve

This application claims the advantage of priority over Chinese Patent Application No. 201911007596.7, filed with the State Intellectual Property Office of China on October 22, 2019 under the name "ELECTROMAGNETIC VALVE", the entirety of which is incorporated herein by reference. .

TECHNICAL FIELD This application relates to the technical field of fluid control, and specifically to electromagnetic valves.

An electromagnetic valve generally includes a valve body, a valve sleeve, a valve core, a fixed iron core, a movable iron core, and a valve port portion. The principle of operation of the electromagnetic valve is that an external electromagnetic coil is energized to generate electromagnetic attraction between the movable iron core and the fixed iron core, and the movable iron core drives the valve core and moves toward the fixed iron core to open the valve port of the valve port part, and the electromagnetic coil After the power is turned off, the movable iron core under the action of the return spring force drives the valve core to move it away from the fixed iron core to close the valve port.

Accordingly, a problem considered by a person skilled in the art is how to improve the valve opening performance during the valve opening process of the electromagnetic valve.

The electromagnetic valve provided by the present application includes a valve body, a valve sleeve, a valve core, a fixed iron core, a movable iron core, and a first valve port portion. The fixed iron core is fixedly connected to the valve sleeve, and the movable iron core is located at least partially in the inner cavity of the valve sleeve. The valve body includes a flow path inlet end and a flow path outlet end, and the valve core may abut the first valve port portion. The electromagnetic valve further includes a limiting member, a first spring, and a second spring. the limiting member is located at least partially in the inner cavity of the movable iron core, the limiting member is capable of abutting the valve core, one end of the first spring abutting the limiting member, and the other end of the first spring abutting the stationary iron core; One end of the second spring abuts against the movable iron core, the other end of the second spring abuts against the valve core, the limiting member includes a first limiting portion, and the movable iron core abuts a second limiting portion capable of abutting the first limiting portion. part, wherein the movable iron core is capable of moving toward the fixed iron core by driving the limiting member, the valve core includes a third limiting part, and the movable iron core includes a fourth limiting part capable of abutting the third limiting part; The movable iron core may drive the valve core to move toward the fixed iron core.

The electromagnetic valve provided by the present application can improve the valve opening performance of the electromagnetic valve by setting movement restrictions between the limiting member and the movable iron core and movement restrictions between the movable iron core and the valve core.

1 is a schematic structural diagram of an electromagnetic valve provided by the present application in a closed state;
Fig. 2 is a schematic structural diagram of the electromagnetic valve shown in Fig. 1 in an open state;
FIG. 3 is a partially enlarged view of FIG. 1 ;
FIG. 4 is a partially enlarged view of FIG. 2 .
FIG. 5 is a schematic structural diagram of the limiting member of FIG. 1 .
6 is a schematic structural diagram of the valve core of FIG. 1 .
FIG. 7 is a schematic structural diagram of a nested member of FIG. 1 ;
8 is a schematic diagram of an action relationship of components of an embodiment of an electromagnetic valve in a valve opening process;
9 is a schematic structural diagram of another electromagnetic valve provided by the present application in a closed state;

In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in more detail with reference to the drawings and specific examples. Apparently, the drawings in the following description show only some embodiments of the present invention, and other drawings may be obtained from the drawings by those skilled in the art without working on the present invention. Orientation terms related to the present application, such as upper side, lower side, etc., are defined with reference to the relative positions of the components as shown in the drawings, and this is only for clearly and easily explaining the technical solution. It should be understood that the orientation terms used herein should not limit the scope of protection herein.

1 and 2 are schematic structural diagrams of an electromagnetic valve provided by the present application in a closed state and an open state.

1 and 2 are referenced.

The electromagnetic valve provided in this particular embodiment is a two stage pilot electromagnetic valve structure including a main valve component 100 , a pilot valve component 200 , and a piston component 300 .

The main valve component 100 includes a valve body 110 . The valve body 110 includes a body 130 and a mounting sealing cap 120 . The mounting sealing cap 120 is fixedly connected to the body 130 by screws or welding. The side wall portion and the axial bottom portion of the body 130 are respectively welded with connecting pipes that can be used as the flow path inlet end 112 and the flow path outlet end 113 . The main valve component 100 further includes a valve cavity 400 . The flow path inlet end 112 may communicate directly with the valve cavity 400 , and the flow path outlet end 113 may communicate with the valve cavity 400 through the valve port of the second valve port portion 111 .

The piston component 300 is disposed in the valve cavity 400 and is axially slidable in the valve cavity 400 .

The pilot valve component 200 includes a valve sleeve 210 , a fixed iron core 260 , and a movable iron core 230 . The valve sleeve 210 is welded to the mounting sealing cap 120 , and the fixed iron core 260 is welded and fixed to the valve sleeve 210 and seals the valve sleeve 210 to the inner cavity of the valve sleeve 210 . A pilot valve cavity 500 is formed at 211 , and the pilot valve cavity 500 communicates with the valve cavity 400 .

The movable iron core 230 is disposed in the pilot valve cavity 500 (the inner cavity 211 of the valve sleeve 210 ), and can slide in the axial direction in the pilot valve cavity 500 . The electromagnetic coil 290 is sleeved on the exterior of the valve sleeve 210 .

3 is a partially enlarged view of FIG. 1 , FIG. 4 is a partially enlarged view of FIG. 2 , FIG. 5 is a schematic structural diagram of a limiting member, FIG. 6 is a schematic structural diagram of a valve core, and FIG. 7 is a schematic structural diagram of an overlapping member to be.

Reference is made to FIGS. 3, 4, 5, 6, and 7 .

In this embodiment, the movable iron core 230 includes a core body 232 and an overlapping member 240 . The overlapping member 240 has a substantially cylindrical shape, overlaps the inner hole at the lower end of the core body 232 , and is fixedly connected to the core body 232 . The advantage of this design is that the core body 232 can be made of a soft magnetic material, the shape of the overlap member 240 is relatively complex, and can be made of a common material that is easy to process, improving the manufacturability of the parts. and material cost can be saved, which is not further described herein.

The valve core 220 is partially disposed in the inner cavity 231 of the movable iron core, and the limiting member 250 is disposed in the inner cavity 231 of the movable iron core. The limiting member 250 may slide in the inner cavity 231 of the movable iron core, and may abut against the valve core 220 .

The limiting member 250 is generally cylindrical and includes a first through hole 253 penetrating from the top to the bottom. The outer edge portion of the limiting member 250 is provided with a first outer flange portion as the first limiting portion 251 . The outer wall surface of the first outer flange part 251 is slidably fitted to the inner wall surface of the core body 232 . The core body 232 further includes a first inner flange portion as a second limiting portion 233 . Through the cooperation of the first limiting part 251 and the second limiting part 233 , the movable iron core 230 may drive the limiting member 250 to move toward the fixed iron core 260 .

One end of the first spring 270 abuts against the upper flange surface 252 of the first outer flange portion 251 , and the other end of the first spring 270 abuts against the fixed iron core 260 .

The valve core 220 has a substantially thin rod shape and includes a first through hole 222 penetrating an upper end portion and an outer edge portion of the valve core 220 . The outer edge portion of the valve core 220 is provided with a second outer flange portion as a third limiting portion 221 . The outer wall surface of the second outer flange part 221 is slidably fitted to the inner wall surface of the overlapping member 240 . The overlapping member 240 further includes a second inner flange portion as a fourth limiting portion 242 . Through the cooperation of the third limiter 221 and the fourth limiter 242 , the movable iron core 230 may drive the valve core 220 to move toward the fixed iron core 260 .

The overlapping member 240 includes a third through hole 244 communicating the valve cavity 400 below the piston component 300 and the inner cavity 231 of the movable iron core. The overlapping member 240 further includes a lower flange portion 243 . One end of the second spring 280 abuts against the step surface of the lower flange portion 243 , and the other end of the second spring 280 is a lower end surface of the second outer flange portion 221 of the valve core 220 . touches on

The piston component 300 includes a piston body 310 and a piston core 320 , the piston core 320 being superimposed on the piston body 310 , the piston body 310 being relative to the piston core 320 . can slide with

A lower portion of the piston body 310 includes an inner step 311 , and an upper portion of the piston core 320 includes an outer step 324 . The inner step 311 may cooperate with the outer step 324 so that the piston body 310 drives the piston core 320 to move it toward the movable iron core 230 .

The lower end of the piston core 320 serves as a seal 321 , the seal 321 being adapted to fit the second valve port portion 111 . The central through-hole of the piston core 320 functions as a first flow passage, and the central through-hole extends to an upper end surface of the piston core 320 to form a valve port of the first valve port portion 322 . The valve core 220 is adapted to fit the first valve port portion 322 .

The mounting sealing cap 120 is generally cylindrical in shape and includes an outer protrusion 121 at the upper end and an inner protrusion 123 at the lower end. The stepped surface 122 of the outer protrusion 121 cooperates with the upper end surface 115 of the body 130 to form a welding surface. The stepped surface 124 of the inner protrusion 123 abuts against the lower end surface 212 of the valve sleeve 210 to form a welding surface.

The inner protrusion 123 as the upper limiter cooperates with the piston body 310 and can limit the stroke of the piston body 310 moving toward the movable iron core 230 . The body 130 further includes a protruding ring 114 that protrudes toward the valve cavity 400 . The protruding ring 114 as the lower limiter cooperates with the piston body 310 and can limit the stroke of the piston body 310 moving towards the second valve port portion 111 .

8 is a schematic diagram of an action relationship of components of an embodiment of an electromagnetic valve in a valve opening process;

Reference is made to FIG. 8 , with further reference to FIGS. 1 and 2 . In this figure, the valve opening process is performed in six steps from state A to state G, and is described in detail as follows.

1. State A:

The electromagnetic coil 290 is not energized, and by the force of the first spring 270 , the limiting member 250 abuts against the valve core 220 , the valve core 220 abuts against the piston core 320 , and The first valve port 322 is closed, and at the same time, the movable iron core 230 is forcibly abutted against the piston core 320 , and the piston core 320 abuts against the second valve port portion 111 . The electromagnetic valve is closed.

In the state A, the first limiting part 251 of the limiting member 250 is axially separated from the second limiting part 233 of the movable iron core 230 , and the third limiting part 221 of the valve core 220 . ) is separated from the fourth limiting portion 242 of the movable iron core 230 , the piston body 310 of the piston component 300 is axially separated from the piston core 320 , and the piston component 300 is separated from the piston core 320 . of the piston body 310 is separated from the upper limiting portion 123 of the mounting sealing cap 120 . In the state A, the axial minimum distance between the movable iron core 230 and the fixed iron core 260 is defined as H1, and the axial minimum distance between the third limiting part 221 and the fourth limiting part 242 is H2. is defined, and the minimum distance in the axial direction between the first limiting part 251 and the second limiting part 233 is defined as H3. H1, H2, H3 then satisfy: H1 is greater than H2 and H2 is greater than or equal to H3 (ie, H1>H2 and H2≥H3).

2. The process from state A to state B:

The electromagnetic coil 290 is energized, and by the action of the electromagnetic field force, the movable iron core 230 overcomes the force of the second spring 280 , and the first limiting part 251 becomes the second limiting part 233 . It moves upward while moving away from the piston core 320 until it axially abuts on the . In this step, since the movable iron core only needs to overcome the small resistance of the second spring 280, the valve opening performance is improved. Since H1>H2 and H2≥H3, the movable iron core 230 does not abut against the fixed iron core 260 in the state B.

3. The process from state B to state C:

The movable iron core 230 drives the first limiting part 251 to move upward until the third limiting part 221 comes into contact with the fourth limiting part 242 (the movable iron core 230 is a fixed iron core) (260) has not yet been reached).

In state C, the valve core 220 does not move because the downward valve closing force of the fluid received by the valve core 220 is greater than the upward valve opening force applied by the second spring 280 .

4. The process from state C to state D:

The movable iron core 230 overcomes the force of the first spring 270 to further move the first limiting part 252 upward, and at the same time, the movable iron core 230 has ) until the core 220 is driven to move away from the first valve port portion 322 and move upward.

In this process, since the distance between the movable iron core 230 and the fixed iron core 260 is short and the attractive force is large, the valve port of the first valve port part 322 is easy to open smoothly, which improves the valve opening performance .

5. The process from state D to state E:

The movable iron core 230 stops moving upward after abutting the fixed iron core 260 . After the valve is opened, the downward force of the fluid received by the valve core 220 is removed, and by the action of the second spring 280 , the valve core 220 comes into contact with the second limiter 233 . move further upwards until

6. The process from state E to state F:

The pilot valve is opened, and the high-pressure medium in the inner cavity 231 of the movable iron core of the valve cavity 400 flows to the flow path outlet end 113 through the first flow passage 323 . Since the upper portion of the piston body 310 is a medium pressure region and the lower portion is a high pressure region, the piston body 310 moves upward until it comes into contact with the piston core 320 by the action of the upper and lower pressure difference.

7. The process from state F to state G:

The piston body 310 moves further upwards. Since the upper portion of the piston core 320 is a medium pressure region and the lower portion is a low pressure region, the piston core 320 receives a downward force, and the piston body 310 receives a downward force until the piston body 310 contacts the upper limiting portion 123 . ) continues to be in contact with

During the above-described valve opening process of the valve, the relative axial distance between the movable iron core 230 and the fixed iron core 260 is relatively long in the first stage when the valve is just started, and the attractive force is relatively weak. In the subsequent second step, the relative axial distance between the movable iron core 230 and the fixed iron core 260 is relatively short, and the attractive force is relatively strong. Correspondingly, in the given technical solution, in the first step, the movable iron core 230 only needs to overcome the small force of the second spring 280 to move upward, and in the second step, the movable iron core 230 is Overcoming the force of the first spring 270 drives the valve core 220 to open the valve port. Thus, with the energy of the coil unchanged, this solution can optimize the design and improve the valve opening performance.

The valve closing process of the electromagnetic valve is just the opposite, that is, from state G to state A, which is not repeated here.

In addition, another advantage of the present application is, in the valve closing process, the movable iron core 230 first abuts against the outer edge of the first valve port portion 322 and withstands most of the moving impact force, so the first valve port portion The impact between the inner periphery of the 322 and the valve core 220 is relatively reduced, and the life of the piston core 320 and the valve port portion is extended.

In addition, another advantage of the present disclosure is that the limiting member 250 abuts against the fixed iron core 260 through the first spring 270 , and the movable iron core 230 moves through the second spring 280 through the valve core 220 . ), the valve core 220 and the limiting member 250 are subjected to the action of a spring force in the axial direction, and are not easily displaced in the radial direction and are not shaken. Therefore, the electromagnetic valve of the above-described structure may be mounted in a non-vertical direction (the axis of movement of the valve core 220 is not necessarily vertical), which means that the valve core 220 or the limiting member 250 is Do not shake, do not damage the valve port, and expand the installation environment of the electromagnetic valve.

9 is a schematic structural diagram of another electromagnetic valve provided by the present application in a closed state;

As shown in Fig. 9, the difference from the previous technical solution is that the direct acting electromagnetic valve, the electromagnetic valve of this embodiment does not have a piston component, but a beneficial effect diagram of the above solution, which is not repeated here that it can be achieved.

The above embodiments are only preferred embodiments of the present application. It should be noted that other improvements and modifications may be further made to those skilled in the art without departing from the principles of the present application, and such improvements and modifications should also be considered to fall within the protection scope of the present application.

100 Main Valve Components
110 valve body
111 second valve port part
112 flow path inlet end
113 flow path exit end
114 Protrusion ring/lower limiter
115 upper end face
120 mounting sealing cap
121 Outer protrusion
122 Step surface of the outer protrusion
123 inner protrusion/upper limiter
124 Step surface of the inner protrusion
130 body
200 Pilot Valve Components
210 valve sleeve
211 Inner cavity of valve sleeve
212 Lower end face of valve sleeve
220 valve core
221 Third limiting part/second outer flange part
222 second through hole
223 upper end face
230 movable iron core
231 Inner cavity of movable iron core
232 core body
233 second limiting portion/first inner flange portion
240 Overlapping parts
242 fourth limiting part/second inner flange part
243 Lower flange part
244 third through hole
250 no limit
251 first limiting portion/first outer flange portion
252 upper flange face
253 first through hole
254 lower end face
260 fixed iron core
270 first spring
280 second spring
290 electromagnetic coil
300 piston components
310 piston body
311 inner step
320 piston core
321 seal
322 first valve port part
323 first flow passage
324 Outside Step
400 valve cavity
500 pilot valve cavity

Claims (10)

An electromagnetic valve comprising:
a valve body, a valve sleeve, a valve core, a fixed iron core, a movable iron core, and a first valve port portion, the fixed iron core being fixedly connected to the valve sleeve, the movable iron core being at least partially in an inner cavity of the valve sleeve wherein the valve body includes a flow path inlet end and a flow path outlet end, the valve core is configured to abut the first valve port portion, and the electromagnetic valve includes a restriction member, a first spring, and a second spring. further comprising,
The limiting member is located at least partially in the inner cavity of the movable iron core, the limiting member is configured to abut the valve core, one end of the first spring abuts the limiting member, and the other end of the first spring abuts is in contact with the fixed iron core, one end of the second spring is in contact with the movable iron core, and the other end of the second spring is in contact with the valve core,
The limiting member includes a first limiting part, the movable iron core includes a second limiting part configured to abut the first limiting part, and the movable iron core is configured to drive the limiting member to move toward the fixed iron core. become,
The valve core includes a third limiting portion, the movable iron core includes a fourth limiting portion configured to abut the third limiting portion, and the movable iron core is configured to drive the valve core to move toward the fixed iron core. , electromagnetic valve. The limiting member according to claim 1, wherein the limiting member is cylindrical and includes a first outer flange portion, the first outer flange portion functions as the first limiting portion, the movable iron core includes a first inner flange portion, and , wherein the first inner flange portion functions as the second limiting portion, and the first spring abuts on the first outer flange portion. The valve core according to claim 1, wherein the valve core includes a second outer flange portion, the second outer flange portion functions as the third limiting portion, and the movable iron core includes a second inner flange portion, and the second The inner flange portion functions as the fourth limiting portion, and the second spring abuts the second outer flange portion. 4. The movable iron core according to claim 3, wherein the movable iron core includes a core body and a nested member, the core body is fixedly connected to the overlapping member, the overlapping member is cylindrical, and the overlapping member has a lower flange portion. and wherein the second spring abuts on the lower flange portion. The axial minimum distance between the movable iron core and the fixed iron core when the electromagnetic valve is closed is defined as H1, wherein the third limiting portion and the fourth limiting portion are defined as H1. The minimum axial distance between the first and second limits is defined as H2, the minimum axial distance between the first and second limits is defined as H3, and H1, H2, H3 indicate that H1 is greater than H2 and H2 is greater than or equal to H3. To meet, electromagnetic valve. 6. The method according to claim 5, wherein the rigidity of the first spring is greater than that of the second spring, and when the electromagnetic valve is opened, the limiting member abuts against the valve core and the valve core is connected to the first valve port portion. wherein the limiting member abuts against the valve core and the valve core abuts against the first valve port portion when the electromagnetic valve is closed. 5. The valve body of any one of claims 1 to 4, wherein the valve body further comprises a second valve port portion, the electromagnetic valve comprises a piston component, and wherein the piston component comprises: a seal, a first flow a passageway; and the first valve port portion, the piston component disposed in a valve cavity of the electromagnetic valve, the seal configured to abut the second valve port portion, the first flow passageway comprising the second valve port portion; The electromagnetic valve, configured to communicate the valve port of the first valve port portion with the valve port of the second valve port portion. 8. The piston of claim 7, wherein the piston component includes a piston body and a piston core, the piston body configured to drive the piston core to move toward the movable iron core, and wherein the valve body comprises an upper limiting portion and a lower portion further comprising a limiter, wherein the upper limiter is configured to limit a stroke of the piston body moving toward the movable iron core, and the lower limiter is configured to limit a stroke of the piston body moves toward the second valve port part , electromagnetic valve. 9. The valve body of claim 8, wherein the valve body includes a body and a mounting seal cap, the mounting seal cap is fixedly connected to the body, the valve sleeve is fixedly connected to the mounting seal cap, and the mounting seal cap is the An electromagnetic valve comprising an upper restriction. 10. The mounting seal cap of claim 9, wherein the mounting seal cap is cylindrical, an upper end of the mounting seal cap comprises an outer protrusion, a lower end of the mounting seal cap comprises an inner protrusion, and the inner protrusion comprises the upper limiter. wherein an end face of the outer protrusion abuts an upper end face of the body to form a weld face, and a lower end of the valve sleeve abuts the inner protrusion.

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